The 2009 Buick Enclave is available as a 4-door, 7-seat sport utility. Starting at $35,070, the 2009 Buick Enclave CX FWD is powered by a 3.6L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway. The top of the line 2009 Buick Enclave CXL AWD, priced at $39,380, is powered by a 3.6L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.